A book by German author Frank Schätzing has just been adapted for German TV. I recently saw the trailer and then promptly forgot about it again. I was just reminded, so I guess I have an idea what I might be doing tomorrow: watch the first three episodes available online. The book was published in 2004 and I think my mum might have given it to me for Christmas that year. I read it in 2005. With a hardback edition of 1000 pages quite a hefty creature feature.

Der Schwarm
by Frank Schätzing
I read this book in German, but there is a link to the English version behind the book cover above.
Whales begin sinking ships. Toxic, eyeless crabs poison Long Island’s water supply. The North Sea shelf collapses, killing thousands in Europe. Around the world, countries are beginning to feel the effects of the ocean’s revenge as the seas and their inhabitants begin a violent revolution against mankind
https://www.goodreads.com/book/show/68146.The_Swarm
My review from 2005:
A fisherman disappears near the coast of Peru. Without a trace. Norwegian oil drilling experts discover strange organisms, covering hundreds of square kilometers of sea floor. Whales along the coasts of British Columbia change their behaviour. None of this seems to be connected. But biologist Sigur Johanson does not believe in coincidences. And wale expert Leon Anawak draws disturbing conclusions. A catastrophy seems unavoidable. The search for the cause of all this becomes their worst nightmare.
Very long, very good – I liked the first part with the build-up of all the action better than the latter part, but won’t tell you why. I don’t want to give any of the storyline away. Would make a great blockbuster, a bit like “The Day After Tomorrow”, but this time animals strike instead of the weather… Creepy. Suspenseful.